I am getting an error “ts.p.colModel[idn] is undefined”. The datatype I am using is jasonstring and the datastr data I am passing is as follows

var response = "{'page':'1', 'total':1.0,'records':'2','rows':[{'v_id':'5','cell':['mi_adizero','live','mi team jersey mi teamwear shorts']},{'v_id':'2','cell':['mi_teamwear','live','mi team jersey mi teamwear shorts']}]}”

The functiona I am using to build the grid is

jQuery(document).ready(function(){
jQuery(”#list2″).jqGrid({
    url:'myurl',
   datatype: 'jsonstring',
    datastr : response,
   colNames:['Id','Name', 'Email', 'Role'],
   colModel:[
        {name:'v_id',index:'v_id', width:30},
        {name:'v_name',index:'v_name', width:150},
     {name:'v_email',index:'v_email asc, invdate', width:200},
        {name:'v_role',index:'v_role', width:150, align:"right"}
        //{name:'tax',index:'tax', width:80, align:"right"},  
        //{name:'total',index:'total', width:80,align:"right"},  
        //{name:'note',index:'note', width:150, sortable:false}  
    ],
    pager: jQuery('#pager2'),
    rowNum:10,
    rowList:[10,20,30],
    imgpath: 'pathtoimages',
    sortname: 'v_id',
    viewrecords: true,
    sortorder: “desc”,
    caption: “Vendor Listing”,
});
});

I would appreciate if you could find out the solution for me.

Thanks and Regards

Ranju